PTP frequency correction on i.MX7Dual Sabre board does not work

aleks_007 — Wed, 22 Apr 2026 17:33:08 GMT

Hi,

I have yocto 6.18-whinlatter build on imx7dsabresd. Board eth1 is connected directly to Gb Eth port on ubuntu pc acting as GMC.

Setup: timestamp: hardware, L2, E2E (same on both sides). Tried also P2P without any change.

Status:

ptp4l itself is running and processing traffic
ptp4l itself is running and processing traffic
L2 transport is at least partially working
The servo loop is running (but not converging)
Clock adjustment interface is reachable

What is not working

No real synchronization (offset ~70 seconds)
No servo convergence

Output from sabre board:

journalctl -u ptp4l -f
Apr 22 17:09:40 sabre ptp4l[2464]: ptp4l[155781.900]: rms 71226758544 max 71226804804 freq +7663667 +/- 0 delay -116854 +/- 0
Apr 22 17:09:41 sabre ptp4l[2464]: ptp4l[155783.700]: rms 71228752192 max 71229030928 freq +7663667 +/- 0 delay -132657 +/- 0
Apr 22 17:09:43 sabre ptp4l[2464]: ptp4l[155785.500]: rms 71228944076 max 71229050017 freq +7663667 +/- 0 delay -77441 +/- 55216
Apr 22 17:09:45 sabre ptp4l[2464]: ptp4l[155787.300]: rms 71229661065 max 71230564551 freq +7663667 +/- 0 delay 1673 +/- 0
Apr 22 17:09:47 sabre ptp4l[2464]: ptp4l[155789.101]: rms 71231298512 max 71231338212 freq +7663667 +/- 0 delay 1673 +/- 0
Apr 22 17:09:49 sabre ptp4l[2464]: ptp4l[155790.901]: rms 71231204103 max 71231241274 freq +7663667 +/- 0 delay 1673 +/- 0
Apr 22 17:09:50 sabre ptp4l[2464]: ptp4l[155792.701]: rms 70167499092 max 71233271909 freq +7663667 +/- 0 delay -4187 +/- 0
Apr 22 17:09:52 sabre ptp4l[2464]: ptp4l[155794.501]: rms 71233298545 max 71233330758 freq +7663667 +/- 0 delay -3246 +/- 941
Apr 22 17:09:54 sabre ptp4l[2464]: ptp4l[155796.301]: rms 71233259853 max 71233297985 freq +7663667 +/- 0 delay 1846 +/- 0
Apr 22 17:09:56 sabre ptp4l[2464]: ptp4l[155798.102]: rms 71235540484 max 71235852602 freq +7663667 +/- 0 delay -6786 +/- 1960

Question: Was anyone being able to get PTP with L2 transport (E2E or P2P) working on imx7dsabresd?

Re: PTP frequency correction on i.MX7Dual Sabre board does not work

kef2 — Thu, 23 Apr 2026 10:17:22 GMT

ptp4l synchronizes PTP clocks. phc2sys is used to synchronize system clock to PTP clock.

Re: PTP frequency correction on i.MX7Dual Sabre board does not work

aleks_007 — Sun, 26 Apr 2026 18:41:25 GMT

Yes, both services are running, but still with offset

i.MX SolutionsのトピックPTP frequency correction on i.MX7Dual Sabre board does not work

PTP frequency correction on i.MX7Dual Sabre board does not work

Re: PTP frequency correction on i.MX7Dual Sabre board does not work

Re: PTP frequency correction on i.MX7Dual Sabre board does not work